Washington County Oregon (Vacant / Not In Use) has 5 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include West Union Baptist Church, Fanno, Augustus, Farmhouse, Manning--Kamna Farm, Waggener, JS and Melinda, Farmstead and Young, John Quincy Adams and Elizabeth, House.
The famous person Augustus Fanno is associated with one of more of the Washington County historic places.
Some of the country's most noteable architects helped create the Washington County places including William Kane. Prominent architectural styles found in Washington Country are Late Victorian and Mid 19th Century Revival.